drivers/media/video/mt9m001.c

   1 /*
   2  * Driver for MT9M001 CMOS Image Sensor from Micron
   3  *
   4  * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/videodev2.h>
  12 #include <linux/slab.h>
  13 #include <linux/i2c.h>
  14 #include <linux/log2.h>
  15
  16 #include <media/v4l2-common.h>
  17 #include <media/v4l2-chip-ident.h>
  18 #include <media/soc_camera.h>
  19
  20 /* mt9m001 i2c address 0x5d
  21  * The platform has to define i2c_board_info
  22  * and call i2c_register_board_info() */
  23
  24 /* mt9m001 selected register addresses */
  25 #define MT9M001_CHIP_VERSION            0x00
  26 #define MT9M001_ROW_START               0x01
  27 #define MT9M001_COLUMN_START            0x02
  28 #define MT9M001_WINDOW_HEIGHT           0x03
  29 #define MT9M001_WINDOW_WIDTH            0x04
  30 #define MT9M001_HORIZONTAL_BLANKING     0x05
  31 #define MT9M001_VERTICAL_BLANKING       0x06
  32 #define MT9M001_OUTPUT_CONTROL          0x07
  33 #define MT9M001_SHUTTER_WIDTH           0x09
  34 #define MT9M001_FRAME_RESTART           0x0b
  35 #define MT9M001_SHUTTER_DELAY           0x0c
  36 #define MT9M001_RESET                   0x0d
  37 #define MT9M001_READ_OPTIONS1           0x1e
  38 #define MT9M001_READ_OPTIONS2           0x20
  39 #define MT9M001_GLOBAL_GAIN             0x35
  40 #define MT9M001_CHIP_ENABLE             0xF1
  41
  42 static const struct soc_camera_data_format mt9m001_colour_formats[] = {
  43         /* Order important: first natively supported,
  44          * second supported with a GPIO extender */
  45         {
  46                 .name           = "Bayer (sRGB) 10 bit",
  47                 .depth          = 10,
  48                 .fourcc         = V4L2_PIX_FMT_SBGGR16,
  49                 .colorspace     = V4L2_COLORSPACE_SRGB,
  50         }, {
  51                 .name           = "Bayer (sRGB) 8 bit",
  52                 .depth          = 8,
  53                 .fourcc         = V4L2_PIX_FMT_SBGGR8,
  54                 .colorspace     = V4L2_COLORSPACE_SRGB,
  55         }
  56 };
  57
  58 static const struct soc_camera_data_format mt9m001_monochrome_formats[] = {
  59         /* Order important - see above */
  60         {
  61                 .name           = "Monochrome 10 bit",
  62                 .depth          = 10,
  63                 .fourcc         = V4L2_PIX_FMT_Y16,
  64         }, {
  65                 .name           = "Monochrome 8 bit",
  66                 .depth          = 8,
  67                 .fourcc         = V4L2_PIX_FMT_GREY,
  68         },
  69 };
  70
  71 struct mt9m001 {
  72         struct i2c_client *client;
  73         struct soc_camera_device icd;
  74         int model;      /* V4L2_IDENT_MT9M001* codes from v4l2-chip-ident.h */
  75         unsigned char autoexposure;
  76 };
  77
  78 static int reg_read(struct i2c_client *client, const u8 reg)
  79 {
  80         s32 data = i2c_smbus_read_word_data(client, reg);
  81         return data < 0 ? data : swab16(data);
  82 }
  83
  84 static int reg_write(struct i2c_client *client, const u8 reg,
  85                      const u16 data)
  86 {
  87         return i2c_smbus_write_word_data(client, reg, swab16(data));
  88 }
  89
  90 static int reg_set(struct i2c_client *client, const u8 reg,
  91                    const u16 data)
  92 {
  93         int ret;
  94
  95         ret = reg_read(client, reg);
  96         if (ret < 0)
  97                 return ret;
  98         return reg_write(client, reg, ret | data);
  99 }
 100
 101 static int reg_clear(struct i2c_client *client, const u8 reg,
 102                      const u16 data)
 103 {
 104         int ret;
 105
 106         ret = reg_read(client, reg);
 107         if (ret < 0)
 108                 return ret;
 109         return reg_write(client, reg, ret & ~data);
 110 }
 111
 112 static int mt9m001_init(struct soc_camera_device *icd)
 113 {
 114         struct i2c_client *client = to_i2c_client(icd->control);
 115         struct soc_camera_link *icl = client->dev.platform_data;
 116         int ret;
 117
 118         dev_dbg(icd->vdev->parent, "%s\n", __func__);
 119
 120         if (icl->power) {
 121                 ret = icl->power(&client->dev, 1);
 122                 if (ret < 0) {
 123                         dev_err(icd->vdev->parent,
 124                                 "Platform failed to power-on the camera.\n");
 125                         return ret;
 126                 }
 127         }
 128
 129         /* The camera could have been already on, we reset it additionally */
 130         if (icl->reset)
 131                 ret = icl->reset(&client->dev);
 132         else
 133                 ret = -ENODEV;
 134
 135         if (ret < 0) {
 136                 /* Either no platform reset, or platform reset failed */
 137                 ret = reg_write(client, MT9M001_RESET, 1);
 138                 if (!ret)
 139                         ret = reg_write(client, MT9M001_RESET, 0);
 140         }
 141         /* Disable chip, synchronous option update */
 142         if (!ret)
 143                 ret = reg_write(client, MT9M001_OUTPUT_CONTROL, 0);
 144
 145         return ret;
 146 }
 147
 148 static int mt9m001_release(struct soc_camera_device *icd)
 149 {
 150         struct i2c_client *client = to_i2c_client(icd->control);
 151         struct soc_camera_link *icl = client->dev.platform_data;
 152
 153         /* Disable the chip */
 154         reg_write(client, MT9M001_OUTPUT_CONTROL, 0);
 155
 156         if (icl->power)
 157                 icl->power(&client->dev, 0);
 158
 159         return 0;
 160 }
 161
 162 static int mt9m001_start_capture(struct soc_camera_device *icd)
 163 {
 164         struct i2c_client *client = to_i2c_client(icd->control);
 165
 166         /* Switch to master "normal" mode */
 167         if (reg_write(client, MT9M001_OUTPUT_CONTROL, 2) < 0)
 168                 return -EIO;
 169         return 0;
 170 }
 171
 172 static int mt9m001_stop_capture(struct soc_camera_device *icd)
 173 {
 174         struct i2c_client *client = to_i2c_client(icd->control);
 175
 176         /* Stop sensor readout */
 177         if (reg_write(client, MT9M001_OUTPUT_CONTROL, 0) < 0)
 178                 return -EIO;
 179         return 0;
 180 }
 181
 182 static int mt9m001_set_bus_param(struct soc_camera_device *icd,
 183                                  unsigned long flags)
 184 {
 185         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 186         struct soc_camera_link *icl = mt9m001->client->dev.platform_data;
 187         unsigned long width_flag = flags & SOCAM_DATAWIDTH_MASK;
 188
 189         /* Only one width bit may be set */
 190         if (!is_power_of_2(width_flag))
 191                 return -EINVAL;
 192
 193         if (icl->set_bus_param)
 194                 return icl->set_bus_param(icl, width_flag);
 195
 196         /*
 197          * Without board specific bus width settings we only support the
 198          * sensors native bus width
 199          */
 200         if (width_flag == SOCAM_DATAWIDTH_10)
 201                 return 0;
 202
 203         return -EINVAL;
 204 }
 205
 206 static unsigned long mt9m001_query_bus_param(struct soc_camera_device *icd)
 207 {
 208         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 209         struct soc_camera_link *icl = mt9m001->client->dev.platform_data;
 210         /* MT9M001 has all capture_format parameters fixed */
 211         unsigned long flags = SOCAM_PCLK_SAMPLE_FALLING |
 212                 SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_HIGH |
 213                 SOCAM_DATA_ACTIVE_HIGH | SOCAM_MASTER;
 214
 215         if (icl->query_bus_param)
 216                 flags |= icl->query_bus_param(icl) & SOCAM_DATAWIDTH_MASK;
 217         else
 218                 flags |= SOCAM_DATAWIDTH_10;
 219
 220         return soc_camera_apply_sensor_flags(icl, flags);
 221 }
 222
 223 static int mt9m001_set_crop(struct soc_camera_device *icd,
 224                             struct v4l2_rect *rect)
 225 {
 226         struct i2c_client *client = to_i2c_client(icd->control);
 227         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 228         int ret;
 229         const u16 hblank = 9, vblank = 25;
 230
 231         /* Blanking and start values - default... */
 232         ret = reg_write(client, MT9M001_HORIZONTAL_BLANKING, hblank);
 233         if (!ret)
 234                 ret = reg_write(client, MT9M001_VERTICAL_BLANKING, vblank);
 235
 236         /* The caller provides a supported format, as verified per
 237          * call to icd->try_fmt() */
 238         if (!ret)
 239                 ret = reg_write(client, MT9M001_COLUMN_START, rect->left);
 240         if (!ret)
 241                 ret = reg_write(client, MT9M001_ROW_START, rect->top);
 242         if (!ret)
 243                 ret = reg_write(client, MT9M001_WINDOW_WIDTH, rect->width - 1);
 244         if (!ret)
 245                 ret = reg_write(client, MT9M001_WINDOW_HEIGHT,
 246                                 rect->height + icd->y_skip_top - 1);
 247         if (!ret && mt9m001->autoexposure) {
 248                 ret = reg_write(client, MT9M001_SHUTTER_WIDTH,
 249                                 rect->height + icd->y_skip_top + vblank);
 250                 if (!ret) {
 251                         const struct v4l2_queryctrl *qctrl =
 252                                 soc_camera_find_qctrl(icd->ops,
 253                                                       V4L2_CID_EXPOSURE);
 254                         icd->exposure = (524 + (rect->height + icd->y_skip_top +
 255                                                 vblank - 1) *
 256                                          (qctrl->maximum - qctrl->minimum)) /
 257                                 1048 + qctrl->minimum;
 258                 }
 259         }
 260
 261         return ret;
 262 }
 263
 264 static int mt9m001_set_fmt(struct soc_camera_device *icd,
 265                            struct v4l2_format *f)
 266 {
 267         struct v4l2_rect rect = {
 268                 .left   = icd->x_current,
 269                 .top    = icd->y_current,
 270                 .width  = f->fmt.pix.width,
 271                 .height = f->fmt.pix.height,
 272         };
 273
 274         /* No support for scaling so far, just crop. TODO: use skipping */
 275         return mt9m001_set_crop(icd, &rect);
 276 }
 277
 278 static int mt9m001_try_fmt(struct soc_camera_device *icd,
 279                            struct v4l2_format *f)
 280 {
 281         struct v4l2_pix_format *pix = &f->fmt.pix;
 282
 283         v4l_bound_align_image(&pix->width, 48, 1280, 1,
 284                               &pix->height, 32 + icd->y_skip_top,
 285                               1024 + icd->y_skip_top, 0, 0);
 286
 287         return 0;
 288 }
 289
 290 static int mt9m001_get_chip_id(struct soc_camera_device *icd,
 291                                struct v4l2_dbg_chip_ident *id)
 292 {
 293         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 294
 295         if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
 296                 return -EINVAL;
 297
 298         if (id->match.addr != mt9m001->client->addr)
 299                 return -ENODEV;
 300
 301         id->ident       = mt9m001->model;
 302         id->revision    = 0;
 303
 304         return 0;
 305 }
 306
 307 #ifdef CONFIG_VIDEO_ADV_DEBUG
 308 static int mt9m001_get_register(struct soc_camera_device *icd,
 309                                 struct v4l2_dbg_register *reg)
 310 {
 311         struct i2c_client *client = to_i2c_client(icd->control);
 312
 313         if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
 314                 return -EINVAL;
 315
 316         if (reg->match.addr != client->addr)
 317                 return -ENODEV;
 318
 319         reg->size = 2;
 320         reg->val = reg_read(client, reg->reg);
 321
 322         if (reg->val > 0xffff)
 323                 return -EIO;
 324
 325         return 0;
 326 }
 327
 328 static int mt9m001_set_register(struct soc_camera_device *icd,
 329                                 struct v4l2_dbg_register *reg)
 330 {
 331         struct i2c_client *client = to_i2c_client(icd->control);
 332
 333         if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
 334                 return -EINVAL;
 335
 336         if (reg->match.addr != client->addr)
 337                 return -ENODEV;
 338
 339         if (reg_write(client, reg->reg, reg->val) < 0)
 340                 return -EIO;
 341
 342         return 0;
 343 }
 344 #endif
 345
 346 static const struct v4l2_queryctrl mt9m001_controls[] = {
 347         {
 348                 .id             = V4L2_CID_VFLIP,
 349                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
 350                 .name           = "Flip Vertically",
 351                 .minimum        = 0,
 352                 .maximum        = 1,
 353                 .step           = 1,
 354                 .default_value  = 0,
 355         }, {
 356                 .id             = V4L2_CID_GAIN,
 357                 .type           = V4L2_CTRL_TYPE_INTEGER,
 358                 .name           = "Gain",
 359                 .minimum        = 0,
 360                 .maximum        = 127,
 361                 .step           = 1,
 362                 .default_value  = 64,
 363                 .flags          = V4L2_CTRL_FLAG_SLIDER,
 364         }, {
 365                 .id             = V4L2_CID_EXPOSURE,
 366                 .type           = V4L2_CTRL_TYPE_INTEGER,
 367                 .name           = "Exposure",
 368                 .minimum        = 1,
 369                 .maximum        = 255,
 370                 .step           = 1,
 371                 .default_value  = 255,
 372                 .flags          = V4L2_CTRL_FLAG_SLIDER,
 373         }, {
 374                 .id             = V4L2_CID_EXPOSURE_AUTO,
 375                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
 376                 .name           = "Automatic Exposure",
 377                 .minimum        = 0,
 378                 .maximum        = 1,
 379                 .step           = 1,
 380                 .default_value  = 1,
 381         }
 382 };
 383
 384 static int mt9m001_video_probe(struct soc_camera_device *);
 385 static void mt9m001_video_remove(struct soc_camera_device *);
 386 static int mt9m001_get_control(struct soc_camera_device *, struct v4l2_control *);
 387 static int mt9m001_set_control(struct soc_camera_device *, struct v4l2_control *);
 388
 389 static struct soc_camera_ops mt9m001_ops = {
 390         .owner                  = THIS_MODULE,
 391         .probe                  = mt9m001_video_probe,
 392         .remove                 = mt9m001_video_remove,
 393         .init                   = mt9m001_init,
 394         .release                = mt9m001_release,
 395         .start_capture          = mt9m001_start_capture,
 396         .stop_capture           = mt9m001_stop_capture,
 397         .set_crop               = mt9m001_set_crop,
 398         .set_fmt                = mt9m001_set_fmt,
 399         .try_fmt                = mt9m001_try_fmt,
 400         .set_bus_param          = mt9m001_set_bus_param,
 401         .query_bus_param        = mt9m001_query_bus_param,
 402         .controls               = mt9m001_controls,
 403         .num_controls           = ARRAY_SIZE(mt9m001_controls),
 404         .get_control            = mt9m001_get_control,
 405         .set_control            = mt9m001_set_control,
 406         .get_chip_id            = mt9m001_get_chip_id,
 407 #ifdef CONFIG_VIDEO_ADV_DEBUG
 408         .get_register           = mt9m001_get_register,
 409         .set_register           = mt9m001_set_register,
 410 #endif
 411 };
 412
 413 static int mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
 414 {
 415         struct i2c_client *client = to_i2c_client(icd->control);
 416         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 417         int data;
 418
 419         switch (ctrl->id) {
 420         case V4L2_CID_VFLIP:
 421                 data = reg_read(client, MT9M001_READ_OPTIONS2);
 422                 if (data < 0)
 423                         return -EIO;
 424                 ctrl->value = !!(data & 0x8000);
 425                 break;
 426         case V4L2_CID_EXPOSURE_AUTO:
 427                 ctrl->value = mt9m001->autoexposure;
 428                 break;
 429         }
 430         return 0;
 431 }
 432
 433 static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
 434 {
 435         struct i2c_client *client = to_i2c_client(icd->control);
 436         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 437         const struct v4l2_queryctrl *qctrl;
 438         int data;
 439
 440         qctrl = soc_camera_find_qctrl(&mt9m001_ops, ctrl->id);
 441
 442         if (!qctrl)
 443                 return -EINVAL;
 444
 445         switch (ctrl->id) {
 446         case V4L2_CID_VFLIP:
 447                 if (ctrl->value)
 448                         data = reg_set(client, MT9M001_READ_OPTIONS2, 0x8000);
 449                 else
 450                         data = reg_clear(client, MT9M001_READ_OPTIONS2, 0x8000);
 451                 if (data < 0)
 452                         return -EIO;
 453                 break;
 454         case V4L2_CID_GAIN:
 455                 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
 456                         return -EINVAL;
 457                 /* See Datasheet Table 7, Gain settings. */
 458                 if (ctrl->value <= qctrl->default_value) {
 459                         /* Pack it into 0..1 step 0.125, register values 0..8 */
 460                         unsigned long range = qctrl->default_value - qctrl->minimum;
 461                         data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;
 462
 463                         dev_dbg(&icd->dev, "Setting gain %d\n", data);
 464                         data = reg_write(client, MT9M001_GLOBAL_GAIN, data);
 465                         if (data < 0)
 466                                 return -EIO;
 467                 } else {
 468                         /* Pack it into 1.125..15 variable step, register values 9..67 */
 469                         /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
 470                         unsigned long range = qctrl->maximum - qctrl->default_value - 1;
 471                         unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
 472                                                111 + range / 2) / range + 9;
 473
 474                         if (gain <= 32)
 475                                 data = gain;
 476                         else if (gain <= 64)
 477                                 data = ((gain - 32) * 16 + 16) / 32 + 80;
 478                         else
 479                                 data = ((gain - 64) * 7 + 28) / 56 + 96;
 480
 481                         dev_dbg(&icd->dev, "Setting gain from %d to %d\n",
 482                                  reg_read(client, MT9M001_GLOBAL_GAIN), data);
 483                         data = reg_write(client, MT9M001_GLOBAL_GAIN, data);
 484                         if (data < 0)
 485                                 return -EIO;
 486                 }
 487
 488                 /* Success */
 489                 icd->gain = ctrl->value;
 490                 break;
 491         case V4L2_CID_EXPOSURE:
 492                 /* mt9m001 has maximum == default */
 493                 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
 494                         return -EINVAL;
 495                 else {
 496                         unsigned long range = qctrl->maximum - qctrl->minimum;
 497                         unsigned long shutter = ((ctrl->value - qctrl->minimum) * 1048 +
 498                                                  range / 2) / range + 1;
 499
 500                         dev_dbg(&icd->dev, "Setting shutter width from %d to %lu\n",
 501                                  reg_read(client, MT9M001_SHUTTER_WIDTH), shutter);
 502                         if (reg_write(client, MT9M001_SHUTTER_WIDTH, shutter) < 0)
 503                                 return -EIO;
 504                         icd->exposure = ctrl->value;
 505                         mt9m001->autoexposure = 0;
 506                 }
 507                 break;
 508         case V4L2_CID_EXPOSURE_AUTO:
 509                 if (ctrl->value) {
 510                         const u16 vblank = 25;
 511                         if (reg_write(client, MT9M001_SHUTTER_WIDTH, icd->height +
 512                                       icd->y_skip_top + vblank) < 0)
 513                                 return -EIO;
 514                         qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
 515                         icd->exposure = (524 + (icd->height + icd->y_skip_top + vblank - 1) *
 516                                          (qctrl->maximum - qctrl->minimum)) /
 517                                 1048 + qctrl->minimum;
 518                         mt9m001->autoexposure = 1;
 519                 } else
 520                         mt9m001->autoexposure = 0;
 521                 break;
 522         }
 523         return 0;
 524 }
 525
 526 /* Interface active, can use i2c. If it fails, it can indeed mean, that
 527  * this wasn't our capture interface, so, we wait for the right one */
 528 static int mt9m001_video_probe(struct soc_camera_device *icd)
 529 {
 530         struct i2c_client *client = to_i2c_client(icd->control);
 531         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 532         struct soc_camera_link *icl = client->dev.platform_data;
 533         s32 data;
 534         int ret;
 535         unsigned long flags;
 536
 537         /* We must have a parent by now. And it cannot be a wrong one.
 538          * So this entire test is completely redundant. */
 539         if (!icd->dev.parent ||
 540             to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
 541                 return -ENODEV;
 542
 543         /* Enable the chip */
 544         data = reg_write(client, MT9M001_CHIP_ENABLE, 1);
 545         dev_dbg(&icd->dev, "write: %d\n", data);
 546
 547         /* Read out the chip version register */
 548         data = reg_read(client, MT9M001_CHIP_VERSION);
 549
 550         /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
 551         switch (data) {
 552         case 0x8411:
 553         case 0x8421:
 554                 mt9m001->model = V4L2_IDENT_MT9M001C12ST;
 555                 icd->formats = mt9m001_colour_formats;
 556                 break;
 557         case 0x8431:
 558                 mt9m001->model = V4L2_IDENT_MT9M001C12STM;
 559                 icd->formats = mt9m001_monochrome_formats;
 560                 break;
 561         default:
 562                 ret = -ENODEV;
 563                 dev_err(&icd->dev,
 564                         "No MT9M001 chip detected, register read %x\n", data);
 565                 goto ei2c;
 566         }
 567
 568         icd->num_formats = 0;
 569
 570         /*
 571          * This is a 10bit sensor, so by default we only allow 10bit.
 572          * The platform may support different bus widths due to
 573          * different routing of the data lines.
 574          */
 575         if (icl->query_bus_param)
 576                 flags = icl->query_bus_param(icl);
 577         else
 578                 flags = SOCAM_DATAWIDTH_10;
 579
 580         if (flags & SOCAM_DATAWIDTH_10)
 581                 icd->num_formats++;
 582         else
 583                 icd->formats++;
 584
 585         if (flags & SOCAM_DATAWIDTH_8)
 586                 icd->num_formats++;
 587
 588         dev_info(&icd->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
 589                  data == 0x8431 ? "C12STM" : "C12ST");
 590
 591         /* Now that we know the model, we can start video */
 592         ret = soc_camera_video_start(icd);
 593         if (ret)
 594                 goto eisis;
 595
 596         return 0;
 597
 598 eisis:
 599 ei2c:
 600         return ret;
 601 }
 602
 603 static void mt9m001_video_remove(struct soc_camera_device *icd)
 604 {
 605         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 606         struct soc_camera_link *icl = mt9m001->client->dev.platform_data;
 607
 608         dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9m001->client->addr,
 609                 icd->dev.parent, icd->vdev);
 610         soc_camera_video_stop(icd);
 611         if (icl->free_bus)
 612                 icl->free_bus(icl);
 613 }
 614
 615 static int mt9m001_probe(struct i2c_client *client,
 616                          const struct i2c_device_id *did)
 617 {
 618         struct mt9m001 *mt9m001;
 619         struct soc_camera_device *icd;
 620         struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
 621         struct soc_camera_link *icl = client->dev.platform_data;
 622         int ret;
 623
 624         if (!icl) {
 625                 dev_err(&client->dev, "MT9M001 driver needs platform data\n");
 626                 return -EINVAL;
 627         }
 628
 629         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
 630                 dev_warn(&adapter->dev,
 631                          "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
 632                 return -EIO;
 633         }
 634
 635         mt9m001 = kzalloc(sizeof(struct mt9m001), GFP_KERNEL);
 636         if (!mt9m001)
 637                 return -ENOMEM;
 638
 639         mt9m001->client = client;
 640         i2c_set_clientdata(client, mt9m001);
 641
 642         /* Second stage probe - when a capture adapter is there */
 643         icd = &mt9m001->icd;
 644         icd->ops        = &mt9m001_ops;
 645         icd->control    = &client->dev;
 646         icd->x_min      = 20;
 647         icd->y_min      = 12;
 648         icd->x_current  = 20;
 649         icd->y_current  = 12;
 650         icd->width_min  = 48;
 651         icd->width_max  = 1280;
 652         icd->height_min = 32;
 653         icd->height_max = 1024;
 654         icd->y_skip_top = 1;
 655         icd->iface      = icl->bus_id;
 656         /* Simulated autoexposure. If enabled, we calculate shutter width
 657          * ourselves in the driver based on vertical blanking and frame width */
 658         mt9m001->autoexposure = 1;
 659
 660         ret = soc_camera_device_register(icd);
 661         if (ret)
 662                 goto eisdr;
 663
 664         return 0;
 665
 666 eisdr:
 667         kfree(mt9m001);
 668         return ret;
 669 }
 670
 671 static int mt9m001_remove(struct i2c_client *client)
 672 {
 673         struct mt9m001 *mt9m001 = i2c_get_clientdata(client);
 674
 675         soc_camera_device_unregister(&mt9m001->icd);
 676         kfree(mt9m001);
 677
 678         return 0;
 679 }
 680
 681 static const struct i2c_device_id mt9m001_id[] = {
 682         { "mt9m001", 0 },
 683         { }
 684 };
 685 MODULE_DEVICE_TABLE(i2c, mt9m001_id);
 686
 687 static struct i2c_driver mt9m001_i2c_driver = {
 688         .driver = {
 689                 .name = "mt9m001",
 690         },
 691         .probe          = mt9m001_probe,
 692         .remove         = mt9m001_remove,
 693         .id_table       = mt9m001_id,
 694 };
 695
 696 static int __init mt9m001_mod_init(void)
 697 {
 698         return i2c_add_driver(&mt9m001_i2c_driver);
 699 }
 700
 701 static void __exit mt9m001_mod_exit(void)
 702 {
 703         i2c_del_driver(&mt9m001_i2c_driver);
 704 }
 705
 706 module_init(mt9m001_mod_init);
 707 module_exit(mt9m001_mod_exit);
 708
 709 MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
 710 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
 711 MODULE_LICENSE("GPL");